Standard delegates in C# [closed]

Answer 1

Goto Reflector Search for System.MulticastDelegate and check the derived types. You will get list of all the Delegates you are looking for.

Answer 2

They're not predefined in C#. They're defined by the framework.

The Action and Func delegate families are wider than you've shown - they go up to

Action<T1, T2, T3, T4>

and

Func<T1, T2, T3, T4, TResult>

Another common-ish one in .NET 2.0 for list manipulation (before LINQ) is Predicate<T>.

For working with threads:

ThreadStart
ParameterizedThreadStart
WaitCallback
TimerCallback
AsyncCallback

Answer 3

I've also come across

Comparison<T> 

in the

List.Sort(Comparison<T>)

generic method. I suppose this is now equivalent to:

Func<T1, T2, int> 

Answer 4

I use WaitCallback and ThreadStart often enough for them to get a mention.

If you know the signature of the delegate you're after, but you don't know if there's an existing delegate with that signature that you can use, you can follow these instructions on my blog to find one.

Answer 5

I like to use Predicate<T> which is equivalent to Func<T, bool>

Answer 6

System.Windows.ValidateValueCallback which represents a method used as a callback that validates the effective value of a dependency property.

Read More: MSDN: ValidateValueCallback Delegate